ATNI

EX-99.1

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EXHIBIT 99.1

Exhibit 99.1

ATN International, Inc. Reports First Quarter 2026 Results;

Reaffirms 2026 Outlook

Delivers year-over-year

increases in revenue, operating income and Adjusted EBITDA1

Initial closing of the U.S. tower portfolio sale remains on track for Q2 2026

BEVERLY, Mass., May 6, 2026 (GLOBE NEWSWIRE) -- ATN International, Inc. (“ATN”, the “Company”, “we”, “us”, and “our”) (Nasdaq: ATNI), a leading provider of digital infrastructure and communications services, today reported financial results for the first quarter ended March 31, 2026. ATN’s management will host a conference call and webcast tomorrow, May 7, 2026, beginning at 10:00 a.m. Eastern time to review these results.

“As I step into this role, my priority is translating ATN’s foundational capabilities into the next stage of value creation. In my early weeks, I have been actively engaging across our operations and working closely with our leadership teams to assess the business and identify opportunities for simplification and optimization, while maintaining a disciplined approach to capital allocation,” said Naji Khoury, ATN’s Chief Executive Officer.

Mr. Khoury concluded, “I’m confident that my deep telecommunications industry experience, with a strong focus on operational and strategic execution, positions us well to build on the progress and momentum reached in the second half of 2025 and into the first quarter of 2026.”

First Quarter 2026 Operating and Financial Highlights (as compared to the First Quarter 2025)

·High-speed broadband homes passed of 523,300 expanded by 24% supported by fixed wireless deployments in late 2025

·Total high-speed broadband subscribers grew 3% to 142,500

·Revenue increased 2% to $182 million, driven by modest growth in both the international and US segments

·Operating income increased $9.0 million to $11.7 million, driven primarily by higher revenue, cost containment efforts, and lower depreciation and amortization

·Net cash provided by operating activities decreased $6.1 million, or 17%, to $29.8 million, reflecting increased working capital requirements largely due to the timing of government payments

·Adjusted EBITDA1 increased $4.3 million, or 10%, to $48.6 million

·Net Debt Ratio3 improved to 2.30x from 2.52x

“Our first-quarter results reflect solid performance across our business,” said ATN’s Chief Financial Officer, Carlos Doglioli. “The team delivered year-over-year increases in total revenue, operating income and Adjusted EBITDA, reflecting steady execution across the entire organization. Revenue increased in both our international and US segments, driven by high-value subscriber growth as well as increased carrier services and ancillary products revenues, which offset expected declines in legacy revenue streams and the loss of US government high-cost support subsidy in one of our markets.”

Mr. Doglioli added, “We continue to benefit from our cost containment initiatives, which, combined with top-line growth, supported improved profitability and margin expansion during the quarter. We remain focused on our financial priorities, including margin improvement, cash flow expansion, and further strengthening the balance sheet.”

First Quarter 2026 Financial Results

Consolidated revenues were $182.2 million, up $2.9 million, or 1.6% versus $179.3 million in the year-ago quarter. The increase was primarily driven by carrier services revenues, which were up $3.0 million, or 8.9% year-over year, reflecting an increase in the number of completed sites in the US segment and market demand in both the international and US segments. Additionally, ancillary service revenues in our international segment were up $1.7 million, or 54.3% year-over-year.

Operating income was $11.7 million, an increase of $9.0 million from the year-ago quarter. The improvement reflects the above-mentioned revenue growth, combined with lower cost of services resulting from our cost containment efforts and lower depreciation and amortization expenses.

Net loss attributable to ATN stockholders was $(2.8) million, or $(0.29) per share, versus a net loss of $(8.9) million, or $(0.69) per share, in the year-ago quarter.

Adjusted EBITDA1 was $48.6 million, up $4.3 million, or 10%, from $44.3 million in the year-ago quarter and the Adjusted EBITDA Margin1 expanded from 24.7% to 26.7% in the first quarter. The increase was primarily driven by higher revenues and lower costs.

US Tower Portfolio Sale Update4

The Company continues to expect the initial closing of the pending US tower portfolio sale to occur in the second quarter of 2026 (the “Initial Closing”) generating gross proceeds of approximately $250 to $270 million. Subsequent closings, totaling approximately $27 to $47 million, are anticipated to occur over the twelve months following the Initial Closing, subject to the achievement of specified construction and operational milestones at designated sites within the tower portfolio

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UNITED STATES

SECURITIES AND

EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 4, 2026

ATN INTERNATIONAL, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-12593

47-0728886

(State or other

(Commission File Number)

(IRS Employer

jurisdiction of incorporation)

Identification No.)

500 Cummings Center

Beverly, MA 01915

(Address of principal executive offices and zip code)

(978) 619-1300

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Title of Each Class

Trading Symbol(s)

Name of each exchange on which

registered

Common Stock, par value $.01 per share

ATNI

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 2.02 Results of Operations and Financial Condition.

On March 4, 2026, ATN International, Inc. (the “Company”) issued a press release announcing financial results for the three and twelve months ended December 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1.

Exhibit 99.1 is furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing made by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release of the Company, dated March 4, 2026

104 Cover Page Data File (formatted as inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ATN INTERNATIONAL, INC.

By: /s/ Carlos Doglioli

Carlos Doglioli

Chief Financial Officer

Dated March 4, 2026

3

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0000879585

2025-11-05 2025-11-05

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

UNITED STATES

SECURITIES AND

EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 5, 2025

ATN INTERNATIONAL, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-12593

47-0728886

(State or other

(Commission File Number)

(IRS Employer

jurisdiction of incorporation)

Identification No.)

500 Cummings Center

Beverly, MA 01915

(Address of principal executive offices and zip code)

(978) 619-1300

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Title of Each Class

Trading Symbol(s)

Name of each exchange on which

registered

Common Stock, par value $.01 per share

ATNI

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 2.02 Results of Operations and Financial Condition.

On November 5, 2025, ATN International, Inc. (the “Company”) issued a press release announcing financial results for the three and nine months ended September 30, 2025. A copy of the press release is furnished herewith as Exhibit 99.1.

Exhibit 99.1 is furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing made by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release of the Company, dated November 5, 2025

104 Cover Page Data File (formatted as inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ATN INTERNATIONAL, INC.

By: /s/ Carlos Doglioli

Carlos Doglioli

Chief Financial Officer

Dated November 5, 2025

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